The family of protein kinases is large and diverse. Protein kinases play critical roles in signal transduction, and are also effective drug target enzymes. Identification of appropriate kinase substrate is proven to be critical in designing kinase assays. SensoLyte® Protein Kinase Substrate Sampler Kit *Biotinylated* is designed to facilitate the characterization of an appropriate peptide substrate for developing a particular protein kinase assay. The kit contains 10 popular biotinylated protein kinase substrates along with two phosphorylated peptide controls. It provides a convenient solution for identifying a suitable substrate for designing biotinylated peptide-based protein kinase assays. All the components in the kit are available in bulk packaging after you identify the appropriate peptide for your assay.